Installing Microsoft Lync.

So I've read a lot of articles about installing Microsoft Lync, and desided to go for it. I only need the messenger part (calling from pc to pc with video). I do not need the IP/SIP telephoni part of Lync. My problem: It works fine internal. But external users can only write to each other. When they try to call, the user recieving the call, cannot answer it, and gets a "network error", when he clicks the answer button.

You could try and use WireShark to see if the traffic is working as expected, this may help you see where the issue could be occurring. It does sound like a firewall or NAT issue, have you tried another router instead of the Cisco ASA by any chance? I know a data center that had some issues with the Cisco ASA's but cant recall if it was with MS Lync or something else.

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Lync needs an edge server for external users. ALL Lync traffic is SIP, not just telephony features. And SIP as a protocol is not NAT friendly. No amount of port forwarding will solve this issue. You need an edge server.

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